WordPress error: Updating failed. Error message: Could not update post in the database, how do I solve this?

When trying to update a page on a clients WordPress, I receive this message: Updating failed. Error message: Could not update post in the database.
Upon research, I’ve tried to disable the Gutenberg plugin and activate the Classic editor, only this is not working.
I can install the Classic editor, but when pressing ‘activate’ I get the message that it’s been activated, however, it hasn’t.
This is the same for when trying to deactivate Gutenberg, the message says it’s deactivated however it is not.
The error message in my PHP looks like so:
PHP message: WordPress database error The total number of locks exceeds the lock table size for query INSERT INTO

Any ideas? Thanks

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